Blocks annoying video ads on YouTube, Facebook ads, banners and much more.
Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).
Xmarks is the #1 bookmarking and open tab add-on. Keep your bookmarks, and open tabs backed up and synchronized across computers and browsers. Mobile phones with Premium access. Utilize LastPass to sync passwords!
Dark theme for Firefox. Inspired by the night launch of STS-116.
Use tamperdata to view and modify HTTP/HTTPS headers and post parameters...
A very simple tabbed browsing extension that loads your homepage when you open a new tab. If you have multiple homepages, the first is chosen.
Skips unnecessary pages on sites like Rapidshare, 4Shared, zShare, Mediafire, and more. Try it out, or watch a demo at http://www.skipscreen.com
Why click through ad-laden pages and wait for countdowns when your computer can do it for you
This extension provides advanced configuration for your browser and many additional options, that are not displayed in the Firefox "Options..." dialog.
Permanently hide content from web pages using the Context Menu. Simply, click and "Remove it Permanently". Now includes previewing of items before removal, support for IFrame as well as lots of advanced features to make it easy for...
Cookie Editor that allows you add and edit session and saved cookies
Cool utility for cleaning up a page (for printing or better viewing) as well as for web development. Displays a red rectangle on the element under the mouse -- hit "w" to go wider (get the containing element), then hit other keystrokes to remove, etc
ANTHEM is a take on originality and recent UI trends for Firefox web browsing. It was built on the original Mac theme that comes OOB with the FF3 install.
Collections are groups of related add-ons that anyone can create and share.Explore Collections